I think the spines are part of the background, a bush or a tree or something. Also saw an elephant. Elephant standing in front of a bush.

I was thinking pig

Who knows? Maybe just an imaginary creature with some fins on its back that happens to look like a dinosaur. The problem is that armchair archaeologists think "this looks like that" has significance when it usually doesn't.

The argument here is that humans lived among dinosaurs. Probably some creationist meme where Earth is just a few thousand years old.

I've heard stupider. Unfortunately.

^why hello there mr obelix i’m a big fan :)^

To me it looks like this thing:

That was added in the 90s when the cathedral was undergoing renovation.

That is entirely possible. AI pictures have been fooling these nuts lately. Sometimes they even say they're AI.

Right there in the lower left-hand corner.

My nephew has a bunch of depictions of dinosaurs in his room.

The only logical conclusion is that dinosaurs have roamed the earth within the last 6 years.

We honestly have no way of knowing (unless this is some sort of common religious iconography, which it might be) what whoever carved it was thinking and why at this point. But I think 'dinosaur' is probably the worst answer.

Gullibility mostly.

And and below it is a Muppet mermaid.

Sit on it, Potsie! It's a dinosaur if I say it's a dinosaur!